Single-phase grounding detection system based on waveform difference and detection method thereof

Abstract

The invention provides a single-phase grounding detection system based on waveform difference. The detection system comprises a zero-sequence current acquisition unit, a voltage acquisition unit, a control processing unit, a key input unit, a storage unit, a display unit, an alarm unit and a communication unit; and the detection system determines a ground fault phase according to the acquired signals, and determines a ground fault line according to the difference of a zero-sequence current during a ground fault. According to the single-phase grounding detection system based on waveform difference and the detection method thereof, the fault phase and a specific fault line can be accurately determined when a grounding fault happens, and the work reliability of a power distribution line is ensured.

Description

technical field [0001] The invention belongs to the technical field of electric power detection, and in particular relates to a single-phase ground detection system based on waveform difference and a detection method thereof. Background technique [0002] When a single-phase ground fault occurs in the system, a relatively small zero-sequence current will be generated, and the line voltage is almost consistent, and it will not have a great impact on the load power supply, so it is not necessary to trip immediately. At present, most of the power systems used in my country can still operate normally for 1-2 hours after a single-phase ground fault occurs, so as to prevent the negative impact of sudden power supply interruption on users. With the wide application of resonant grounding methods and users The requirements for the quality and safety of power supply are gradually rising. Although the system can operate normally after a ground fault occurs, it increases the voltage of ...

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Problems solved by technology

Although the system can operate normally after a ground fault occurs, it will increase the voltage of the non-faulted phase to ground, and work with a fault for a long time will easily cause damage to the insulation at the weak link of the system, resulting in a two-phase short circuit or even a three-phase short circuit. If an arcing ground occurs, it may cause overvoltage of the entire system, which poses a great threat to the stable operation of the entire power grid.

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